To　study　the　influence　of　ambient　temperature　effect　on　the　interaction　mechanism　between　a　semi-integral　abutment　and　soil　behind　the　abutment,　a　simplified　model　of　the　semi-integral　abutment-soil　structure　was　taken　as　the　research　object　to　carry　out　a　displacement-based　quasi-static　test　on　the　semi-integral　abutment-soil　interaction　under　the　action　of　ambient　temperature.　Research　results　show　that　the　hysteresis　curve　of　the　semi-integral　abutment　varies　as　the　seasonal　temperature　changes.　The　seasonal　warming　and　cooling　transformation　sections　have　a　highly　significant　effect　on　the　abutment-soil　interaction,　while　the　continuously　increasing　or　decreasing　sections　have　less　effect　on　it.　The　first　warming　period　of　a　year　has　a　greater　impact　on　the　abutment-soil　interaction.　With　several　quarters　of　temperature　loading,　the　soil　behind　the　abutment　is　gradually　compacted.　The　earth　pressure　variation　tends　to　be　stable,　and　the　increasing　trend　slows　down.　The　effect　of　day-night　temperature　change　on　the　abutment-soil　interaction　varies　from　season　to　season,　with　daytime　warming　in　summer　having　a　small　effect　on　the　abutment-soil　interaction　while　nighttime　cooling　having　a　large　effect,　and　vice　versa　in　winter.　With　the　gradual　increase　in　the　seasonal　temperature,　the　hysteresis　curve　of　the　abutment-soil　interaction　develops　from　concave　to　convex,　showing　a　fuller　shuttle　shape.　The　medium-long-term　ambient　temperature　has　a　large　effect　on　the　abutment-soil　interaction.　After　a　full　year　of　temperature　action,　the　earth　pressure　behind　the　abutment　increases　significantly,　which　produces　the　ratcheting　effect.　There　is　a　large　correlation　between　the　abutment　rotation　angle　and　the　loading　displacement.　With　the　increase　in　the　number　of　cycles,　the　abutment　rotation　angle　first　gradually　increases　and　then　tends　to　level　off.　Under　the　action　of　medium-long-term　ambient　temperature,　the　semi-integral　abutment　gradually　presents　the　trend　of　deflection　in　its　rear　direction.　The　effect　of　day-night　temperature　change　on　the　abutment　rotation　angle　cannot　be　ignored.　Under　the　same　loading　displacement,　the　test　results　of　the　abutment　rotation　angle　considering　the　superimposed　effect　of　seasonal　temperature　and　day-night　temperature　are　94%　higher　than　those　when　only　the　seasonal　temperature　effect　is　taken　into　account.　©　2022　Chang＇an　University.　All　rights　reserved.