是位(wei)于(yu)(yu)(yu)橋面(mian)處(chu)，由于(yu)(yu)(yu)設(she)置在梁端構(gou)造(zao)單薄部位(wei)，直(zhi)接(jie)接(jie)受車(che)輛重復荷載的作用(yong)，又多(duo)顯露于(yu)(yu)(yu)大自(zi)然中，遭到各種自(zi)然要素(su)的影(ying)響，因而，能(neng)夠說彈(dan)性縫是極(ji)易損壞、難以修補的部位(wei)，經常發(fa)作不(bu)同水(shui)平的缺陷。

    受各(ge)種(zhong)要(yao)素的(de)(de)影響，伴(ban)隨這(zhe)橋梁構造的(de)(de)變(bian)位，彈性(xing)縫也將要(yao)發作(zuo)相(xiang)應(ying)的(de)(de)彈性(xing)變(bian)位以順應(ying)構造的(de)(de)變(bian)位，首先(xian)在安裝時要(yao)精確對(dui)彈性(xing)量停止計算，并思索(suo)必(bi)定的(de)(de)充裕量，以確保在今后運營中一(yi)直處于(yu)良好的(de)(de)作(zuo)業情況。

    彈(dan)(dan)(dan)性(xing)(xing)(xing)(xing)縫(feng)安(an)裝時(shi)節的(de)(de)(de)(de)不(bu)同，彈(dan)(dan)(dan)性(xing)(xing)(xing)(xing)縫(feng)預(yu)留(liu)充裕量(liang)有所不(bu)同。假如彈(dan)(dan)(dan)性(xing)(xing)(xing)(xing)縫(feng)安(an)裝在夏(xia)日，此刻是一年(nian)四(si)季(ji)中溫度最(zui)高，不(bu)思(si)索一日之(zhi)內溫度改(gai)動惹(re)起的(de)(de)(de)(de)彈(dan)(dan)(dan)性(xing)(xing)(xing)(xing)改(gai)動，則(ze)在夏(xia)日之(zhi)外的(de)(de)(de)(de)其它三季(ji)梁(liang)體(ti)以(yi)彈(dan)(dan)(dan)性(xing)(xing)(xing)(xing)為主(zhu)，彈(dan)(dan)(dan)性(xing)(xing)(xing)(xing)縫(feng)的(de)(de)(de)(de)變(bian)(bian)(bian)(bian)位(wei)以(yi)伸展為主(zhu)，與(yu)混(hun)凝(ning)(ning)土徐變(bian)(bian)(bian)(bian)的(de)(de)(de)(de)變(bian)(bian)(bian)(bian)位(wei)時(shi)共同的(de)(de)(de)(de)。如彈(dan)(dan)(dan)性(xing)(xing)(xing)(xing)縫(feng)安(an)裝在冬天，則(ze)相對冬天而(er)言，其他三季(ji)內構造(zao)受(shou)均勻溫度的(de)(de)(de)(de)升高而(er)伸長，也(ye)即彈(dan)(dan)(dan)性(xing)(xing)(xing)(xing)縮(suo)(suo)短，與(yu)其混(hun)凝(ning)(ning)土的(de)(de)(de)(de)縮(suo)(suo)短徐變(bian)(bian)(bian)(bian)惹(re)起的(de)(de)(de)(de)變(bian)(bian)(bian)(bian)位(wei)應反向，故彈(dan)(dan)(dan)性(xing)(xing)(xing)(xing)縫(feng)的(de)(de)(de)(de)變(bian)(bian)(bian)(bian)位(wei)在必定量(liang)的(de)(de)(de)(de)范(fan)圍內的(de)(de)(de)(de)改(gai)動。當混(hun)凝(ning)(ning)土變(bian)(bian)(bian)(bian)位(wei)較小，而(er)溫度變(bian)(bian)(bian)(bian)位(wei)最(zui)大時(shi)，彈(dan)(dan)(dan)性(xing)(xing)(xing)(xing)縫(feng)縮(suo)(suo)短量(liang)最(zui)大。彈(dan)(dan)(dan)性(xing)(xing)(xing)(xing)縫(feng)的(de)(de)(de)(de)最(zui)大彈(dan)(dan)(dan)性(xing)(xing)(xing)(xing)變(bian)(bian)(bian)(bian)位(wei)為該(gai)縮(suo)(suo)短量(liang)與(yu)混(hun)凝(ning)(ning)土徐變(bian)(bian)(bian)(bian)變(bian)(bian)(bian)(bian)位(wei)絕對值之(zhi)和。

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