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ইস্পাত ব্রিজ ওয়েস্ট প্লেনস এমও (4) .জেপিজি

জানুয়ারী 19, 2025

ট্রাস ব্রিজের উপর টান এবং সংকোচনের কাজ কীভাবে কাজ করে?

ট্রাস ব্রিজগুলি সিভিল ইঞ্জিনিয়ারিংয়ের একটি মৌলিক দিক, যা বিশাল দূরত্বের বিস্তৃত অবস্থায় ভারী বোঝা দক্ষতার সাথে সমর্থন করার দক্ষতার জন্য পরিচিত। এই সেতুগুলির নকশা উত্তেজনা এবং সংকোচনের নীতিগুলির উপর প্রচুর নির্ভর করে, যা এমন বাহিনী যা কাঠামোগত সদস্যদের উপর কাজ করে

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- 0){ for(var i=0;i =(Math.floor(items.length/2))){ items.eq(i).find(".onlineservice-fixed-blocks-tips").addClass('floatRight') } } } $(window).scroll(function(){ if ($(this).scrollTop() > 300) { $(".onlineservice-fixed-goTop").show(); } else { $(".onlineservice-fixed-goTop").hide(); } }) $(".onlineservice-fixed-goTop").unbind('click').bind('click', function(){ $('html,body').animate({ scrollTop: 0 }, 300) }) $(".sitewidget-onlineService-20231215155607.onlineservice-fixed-left13 .onlineservice-fixed-blocks-items").click(function(){ if($(window).width()<768){ $(this).siblings().removeClass('listHover') $(this).siblings().find(".onlineservice-fixed-blocks-tips[data-ht]").css('height',0) if($(this).hasClass('listHover')){ $(this).removeClass('listHover'); $(this).find('.onlineservice-fixed-blocks-tips').hide(); $(this).find('.onlineservice-fixed-blocks-tips').css('height',0); }else{ $(this).addClass('listHover'); $(this).find('.onlineservice-fixed-blocks-tips').show(); if(!!$(this).find('.onlineservice-fixed-blocks-tips').attr('data-ht')){ var ht=$(this).find('.onlineservice-fixed-blocks-tips').attr('data-ht'); }else{ var ht=$(this).find('.onlineservice-fixed-blocks-tips').css('height'); $(this).find('.onlineservice-fixed-blocks-tips').attr('data-ht',ht) } $(this).find('.onlineservice-fixed-blocks-tips').css('height',ht) } } }) //要在点击空白区域时隐藏 $(document).on("click", function(event) { if($(window).width()<768){ var target = $(event.target); // 判断点击的目标是否是空白区域 if (!target.closest(".sitewidget-onlineService-20231215155607.onlineservice-fixed-left13 .onlineservice-fixed-blocks-items").length) { // 在这里隐藏特定的元素 if($(".sitewidget-onlineService-20231215155607.onlineservice-fixed-left13 .onlineservice-fixed-blocks-items").hasClass('listHover')){ $(".sitewidget-onlineService-20231215155607.onlineservice-fixed-left13 .onlineservice-fixed-blocks-items").removeClass('listHover'); $(".sitewidget-onlineService-20231215155607.onlineservice-fixed-left13 .onlineservice-fixed-blocks-items").find('.onlineservice-fixed-blocks-tips').hide(); $(".sitewidget-onlineService-20231215155607.onlineservice-fixed-left13 .onlineservice-fixed-blocks-items").find('.onlineservice-fixed-blocks-tips').css('height',0); } } } }); $(".sitewidget-onlineService-20231215155607.onlineservice-fixed-left13 .onlineservice-fixed-blocks-items").hover(function(){ if($(window).width()>768){ $(this).addClass('listHover'); if(!!$(this).find('.onlineservice-fixed-blocks-tips').attr('data-wt')){ var wt=$(this).find('.onlineservice-fixed-blocks-tips').attr('data-wt'); }else{ var wt=$(this).find('.onlineservice-fixed-blocks-tips').css('width'); $(this).find('.onlineservice-fixed-blocks-tips').attr('data-wt',wt) } if(wt == '0px' || wt == '0'){ wt = "auto"; } $(this).find('.onlineservice-fixed-blocks-tips').css('width',wt) if($(this).find('>.onlineService_wechat_icon').length != 0){ //经过计算最大高度 var windowHeight = $(window).height(); //父元素距离顶部距离 var topstance = $('.onlineservice-fixed-style.onlineservice-fixed-left13').position().top; //元素距离父元素距离 var distance_p = $(this).find('>.onlineService_wechat_icon').offset().top - $(this).find('>.onlineService_wechat_icon').parent().parent().offset().top; //最终最大高度 var distance = windowHeight - (topstance + distance_p) - 40; $(this).find('.onlineservice-fixed-blocks-tips').css({'max-height':distance ,'overflow-y':'auto'}); } } },function(){ if($(window).width()>768){ $(this).removeClass('listHover'); $(this).find('.onlineservice-fixed-blocks-tips').css('width',0) } }) $(".sitewidget-onlineService-20231215155607.onlineservice-fixed-left13 .onlineservice-fixed-blocks-items").find('.onlineservice-fixed-blocks-tips').css }) }catch(e){try{console && console.log && console.log(e);}catch(e){}} /*id='u_f0b7c92e8a05462eb76943349367f901' guid='u_f0b7c92e8a05462eb76943349367f901' pm_script='sitewidget-onlineService-20231215155607' jumpTo='ubAYJcgKeVuO' type='text/javascript'*/ try{ $(function(){ if (phoenixSite.phoenixCompSettings && typeof phoenixSite.phoenixCompSettings.onlineService !== 'undefined' && typeof phoenixSite.phoenixCompSettings.onlineService.onlineServiceChange == "function") { phoenixSite.phoenixCompSettings.onlineService.onlineServiceChange(".sitewidget-onlineService-20231215155607"); return; } $.getScript("//jqrorwxhmqkplp5m.ldycdn.com/static/assets/widget/script/compsettings/comp.onlineService.settings.js?_=1753920172868", function(){ phoenixSite.phoenixCompSettings.onlineService.onlineServiceChange(".sitewidget-onlineService-20231215155607"); }); }) }catch(e){try{console && console.log && console.log(e);}catch(e){}} /*id='u_1b6f781271e6482ba0f952fbdbd4cc65' guid='u_1b6f781271e6482ba0f952fbdbd4cc65' pm_script='sitewidget-onlineService-20231215155607' jumpTo='ubAYJcgKeVuO' type='text/javascript'*/ try{ $(function(){ $(".sitewidget-onlineService-20231215155607 .onlineService_qr").on("click",function(ev){ if( 'false' == 'true' && $(window).width() > 768 ){ return; } if ($(this).hasClass("sitewidget-onlineService-togglebtn")) { return; } ev.preventDefault(); var src = $(this).attr("data-src"); if (src == "") { return; } var tmp = ' '; if ($("#pop-online-tel").length > 0) { $("#pop-online-tel").remove(); } if ($("#pop-online-qr").length > 0) { $("#pop-online-qr").remove(); } $("body").append(tmp); $("#pop-online-qr .close").on("click",function(){ var parent = $(this).parent(); parent.animate({"opacity": 0},function(){ parent.remove(); }); }); }); $(".sitewidget-onlineService-20231215155607 .onlineService_wechat").on("click",function(ev){ if( 'false' == 'true' && $(window).width() > 768 ){ return; } if ($(this).hasClass("sitewidget-onlineService-togglebtn")) { return; } ev.preventDefault(); var src = $(this).attr("data-src"); if (src == "") { return; } var tmp = '
  ' +' ' +'' +'' +' ' +'
  '; if ($("#pop-online-tel").length > 0) { $("#pop-online-tel").remove(); } if ($("#pop-online-qr").length > 0) { $("#pop-online-qr").remove(); } $("body").append(tmp); $("#pop-online-qr .close").on("click",function(){ var parent = $(this).parent(); parent.animate({"opacity": 0},function(){ parent.remove(); }); }); }); $(".sitewidget-onlineService-20231215155607 .onlineService_kakaotalk").on("click", function(ev) { if( 'false' == 'true' && $(window).width() > 768 ){ return; } if ($(this).hasClass("sitewidget-onlineService-togglebtn")) { return; } ev.preventDefault(); if ($("#pop-online-qr").length > 0) { $("#pop-online-qr").remove(); } var src = $(this).attr("data-src"); if (src == "") { return; } var tmp = '
  ' +' ' +'' +'' +' ' +'
  '; if ($("#pop-online-tel").length > 0) { $("#pop-online-tel").remove(); } if ($("#pop-online-qr").length > 0) { $("#pop-online-qr").remove(); } $("body").append(tmp); $("#pop-online-qr .close").on("click",function(){ var parent = $(this).parent(); parent.animate({"opacity": 0},function(){ parent.remove(); }); }); }) $(".sitewidget-onlineService-20231215155607 .onlineService_qPhoto").on("click", function(ev) { if( 'false' == 'true' && $(window).width() > 768 ){ return; } if ($(this).hasClass("sitewidget-onlineService-togglebtn")) { return; } ev.preventDefault(); if ($("#pop-online-qr").length > 0) { $("#pop-online-qr").remove(); } var src = $(this).attr("data-src"); if (src == "") { return; } var tmp = '
  ' +' ' +'' +'' +' ' +'
  '; if ($("#pop-online-tel").length > 0) { $("#pop-online-tel").remove(); } if ($("#pop-online-qr").length > 0) { $("#pop-online-qr").remove(); } $("body").append(tmp); $("#pop-online-qr .close").on("click",function(){ var parent = $(this).parent(); parent.animate({"opacity": 0},function(){ parent.remove(); }); }); }) $(".sitewidget-onlineService-20231215155607 .onlineService_wPhoto").on("click", function(ev) { if( 'false' == 'true' && $(window).width() > 768 ){ return; } if ($(this).hasClass("sitewidget-onlineService-togglebtn")) { return; } ev.preventDefault(); if ($("#pop-online-qr").length > 0) { $("#pop-online-qr").remove(); } var src = $(this).attr("data-src"); if (src == "") { return; } var tmp = '
  ' +' ' +'' +'' +' ' +'
  '; if ($("#pop-online-tel").length > 0) { $("#pop-online-tel").remove(); } if ($("#pop-online-qr").length > 0) { $("#pop-online-qr").remove(); } $("body").append(tmp); $("#pop-online-qr .close").on("click",function(){ var parent = $(this).parent(); parent.animate({"opacity": 0},function(){ parent.remove(); }); }); }) }) }catch(e){try{console && console.log && console.log(e);}catch(e){}} /*id='u_c832982e2f6b416a9bb6e392af5dae2a' guid='u_c832982e2f6b416a9bb6e392af5dae2a' pm_script='sitewidget-onlineService-20231215155607' jumpTo='ubAYJcgKeVuO' type='text/javascript'*/ try{ (function(window,$,undefined){ $(function(){ $(".onlineService_q").on("click",function(e){ e.preventDefault(); // fbq联系埋点 if (window.fbq) { window.fbq('track', 'ViewContent') } // ttq联系埋点 if (window.ttq) { window.ttq.track('ViewContent') } var currentNum=$(this).data("account"); if (!!currentNum) { var servicePC="http://wpa.qq.com/msgrd?v=3&uin="+currentNum; var serviceMobile="mqqwpa://im/chat?chat_type=wpa&uin="+currentNum+"&version=1&src_type=web&web_src"; if (/(iPhone|iPad|iPod|iOS)/i.test(navigator.userAgent) || /(Android)/i.test(navigator.userAgent)){ window.open(serviceMobile); } else{ window.open(servicePC); } } }) // 互动 $('.sitewidget-onlineService-20231215155607').find('a[class^=onlineService_]').on('click', function (e){ // fbq联系埋点 if (window.fbq) { window.fbq('track', 'ViewContent') } // ttq联系埋点 if (window.ttq) { window.ttq.track('ViewContent') } if(e.currentTarget && e.currentTarget.className.indexOf('onlineService_e')==-1){ window._ldDataLayer && window._ldDataLayer.push && window._ldDataLayer.push(["event", "action_advisory", "click", "onlineService"]); } }) }) })(window,jQuery) }catch(e){try{console && console.log && console.log(e);}catch(e){}} /*id='u_97572e1b0b234d4b889eda78332254bc' guid='u_97572e1b0b234d4b889eda78332254bc' pm_script='sitewidget-onlineService-20231215155607' jumpTo='ubAYJcgKeVuO' type='text/javascript'*/ try{ (function(window,$,undefined){ $(function(){ $('.sitewidget-onlineService *').css("text-align","center !important"); $('.sitewidget-onlineService *').css("direction","initial !important"); }); })(window,jQuery) }catch(e){try{console && console.log && console.log(e);}catch(e){}} })(window, $);
  
  ' +' ' +'' +'' +' ' +'

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